Head trimmer



FIG. 1 is a perspective view of a head trimmer, showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a right side view thereof, the left side view being identical thereto; and,

FIG. 5 is a front view thereof, the back view being identical thereto.

The broken lines in the drawings illustrate portions of the head trimmer and form no part of the claimed design. 

CLAIM The ornamental design for a head trimmer, as shown and described. 